ngx-store
Version:
Angular decorators to automagically keep variables in HTML5 LocalStorage, SessionStorage, cookies; injectable services for managing and listening to data changes and a bit more.
203 lines • 31.7 kB
JavaScript
import { Config, debug } from '../config/config';
const isEqual = require('lodash.isequal');
export class Cache {
static getCacheFor(cacheCandidate) {
let cacheItem = Cache.get(cacheCandidate.key);
if (!cacheItem) {
cacheItem = new CacheItem(cacheCandidate);
debug.log(`Created new CacheItem for ${cacheCandidate.name} for ${cacheItem.utilities[0].utility.getStorageName()}`);
Cache.set(cacheItem);
return cacheItem;
}
debug.log(`Loaded prior CacheItem of ${cacheItem.name}
for ${cacheCandidate.utilities[0].utility.getStorageName()}`);
cacheItem.addTargets(cacheCandidate.targets);
cacheItem.addServices(cacheCandidate.services);
cacheItem.addUtilities(cacheCandidate.utilities);
Cache.set(cacheItem);
return cacheItem;
}
static remove(cacheItem) {
return Cache.items.delete(cacheItem.key);
}
static get(key) {
return Cache.items.get(key);
}
static set(cacheItem) {
if (!Cache.get(cacheItem.key)) {
debug.log('CacheItem for ' + cacheItem.key, cacheItem);
}
Cache.items.set(cacheItem.key, cacheItem);
}
}
Cache.items = new Map();
// tslint:disable:only-arrow-functions
export class CacheItem {
constructor(cacheItem) {
this.name = '';
this.targets = [];
this.services = [];
this.utilities = [];
this.currentTarget = {};
this.proxy = null;
this._key = '';
this.initializedTargets = new Set();
this._key = cacheItem.key;
this.name = cacheItem.name;
this.addTargets(cacheItem.targets);
this.addServices(cacheItem.services);
this.addUtilities(cacheItem.utilities);
}
get key() {
return this._key;
}
saveValue(value, config = {}) {
debug.groupCollapsed('CacheItem#saveValue for ' + this.key + ' in ' + this.currentTarget.constructor.name);
debug.log('new value: ', value);
// if (value === false && this.readValue() === true) debugger;
debug.log('previous value: ', this.readValue());
debug.log('targets.length: ', this.targets.length);
debug.log('currentTarget:', this.currentTarget);
debug.groupEnd();
// prevent overwriting value by initializators
if (!this.initializedTargets.has(this.currentTarget)) {
this.initializedTargets.add(this.currentTarget);
let readValue = this.readValue();
if (config.migrateKey) {
this.migrate(config, this.utilities[0].utility);
readValue = this.readValue();
}
const savedValue = (readValue !== null && readValue !== undefined) ? readValue : value;
let proxy = this.getProxy(savedValue, config);
proxy = (proxy !== null) ? proxy : value;
debug.log('initial value for ' + this.key + ' in ' + this.currentTarget.constructor.name, proxy);
this.propagateChange(savedValue);
return proxy;
}
this.propagateChange(value);
return this.getProxy(value, config);
}
getProxy(value, config = {}) {
if (value === undefined && this.proxy) {
return this.proxy;
} // return cached proxy if value hasn't changed
value = (value === undefined) ? this.readValue() : value;
if (typeof value !== 'object' || value === null) {
this.proxy = value;
return value;
}
if ((!Config.mutateObjects && !config.mutate) || config.mutate === false) {
return value;
}
const _self = this; // alias to use in standard function expressions
const prototype = Object.assign(new value.constructor(), value.__proto__);
prototype.save = function () {
_self.saveValue(value, config);
};
// TODO set prototype for Array.prototype or something
if (Array.isArray(value)) { // handle methods that could change value of array
const methodsToOverwrite = [
'pop', 'push', 'reverse', 'shift', 'unshift', 'splice',
'filter', 'forEach', 'map', 'fill', 'sort', 'copyWithin',
];
for (const method of methodsToOverwrite) {
prototype[method] = function () {
const readValue = _self.readValue();
// @ts-ignore
const result = Array.prototype[method].apply(readValue, arguments);
debug.log('Saving value for ' + _self.key + ' by method '
+ prototype.constructor.name + '.' + method);
_self.saveValue(readValue, config);
return result;
};
}
}
Object.setPrototypeOf(value, prototype);
this.proxy = value;
return value;
}
readValue(config = {}) {
const entry = this.utilities[0];
const value = entry ? entry.utility.get(this.key, entry.config) : null;
return (typeof value !== 'object') ? value : JSON.parse(JSON.stringify(this.getProxy(value, entry.config)));
}
addTargets(targets) {
targets.forEach(target => {
if (this.targets.indexOf(target) === -1) {
if (typeof target === 'object') { // handle Angular Component destruction
const originalFunction = target.ngOnDestroy;
const _self = this;
target.ngOnDestroy = function () {
if (typeof originalFunction === 'function') {
originalFunction.apply(this, arguments);
}
target.ngOnDestroy = originalFunction || function () { };
_self.initializedTargets.delete(target);
_self.targets = _self.targets.filter(t => t !== target);
if (!_self.targets.length) {
_self.services.forEach(service => {
service.keys = service.keys.filter(key => key !== _self._key);
});
_self.resetProxy();
Cache.remove(_self);
}
debug.groupCollapsed(`${_self.key} OnDestroy handler:`);
debug.log('removed target:', target.constructor.name);
debug.log('remaining targets:', _self.targets);
debug.log('cacheItem:', Cache.get(_self.key));
debug.groupEnd();
};
this.targets.push(target);
}
}
});
}
addServices(services) {
services.forEach(service => {
if (this.services.indexOf(service) === -1) {
service.keys.push(this._key);
this.services.push(service);
}
});
}
addUtilities(utilityEntries) {
utilityEntries.forEach(entry => {
if (this.utilities.findIndex(e => e.utility === entry.utility) === -1) {
this.utilities.push(entry);
entry.utility.set(this.key, this.readValue());
}
});
}
resetProxy() {
this.proxy = null;
}
propagateChange(value, source) {
if (isEqual(value, this.readValue())) {
return;
}
this.utilities.forEach(entry => {
const utility = entry.utility;
// updating service which the change came from would affect in a cycle
if (utility === source) {
return;
}
debug.log(`propagating change on ${this.key} to:`, utility);
utility.set(this._key, value, entry.config);
});
}
migrate(config, utility) {
const prefix = (config.prefix || Config.prefix) || '';
const keyExists = (key) => key in utility.getStorage();
const migrateKey = keyExists(prefix + config.migrateKey)
? prefix + config.migrateKey
: config.migrateKey;
if (!keyExists(migrateKey)) {
return;
}
debug.log('Migrating', migrateKey, 'to', config.key, 'in', utility.getStorageName());
const value = utility.get(migrateKey, Object.assign(Object.assign({}, config), { prefix: '' }));
utility.set(this._key, value);
utility.remove(migrateKey, { prefix: '' });
}
}
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{ Config, debug } from '../config/config';\nimport { CacheItemInterface, UtilityEntry } from './cache.interface';\nimport { WebStorageServiceInterface } from '../service/webstorage.interface';\nimport { DecoratorConfig } from '../ngx-store.types';\nimport { WebStorageUtility } from '../utility/webstorage.utility';\n\nconst isEqual = require('lodash.isequal');\n\nexport class Cache {\n  public static items: Map<string, CacheItem> = new Map();\n\n  public static getCacheFor(cacheCandidate: CacheItemInterface): CacheItem {\n    let cacheItem = Cache.get(cacheCandidate.key);\n    if (!cacheItem) {\n      cacheItem = new CacheItem(cacheCandidate);\n      debug.log(`Created new CacheItem for ${cacheCandidate.name} for ${cacheItem.utilities[0].utility.getStorageName()}`);\n      Cache.set(cacheItem);\n      return cacheItem;\n    }\n    debug.log(`Loaded prior CacheItem of ${cacheItem.name}\n     for ${cacheCandidate.utilities[0].utility.getStorageName()}`);\n    cacheItem.addTargets(cacheCandidate.targets);\n    cacheItem.addServices(cacheCandidate.services);\n    cacheItem.addUtilities(cacheCandidate.utilities);\n    Cache.set(cacheItem);\n    return cacheItem;\n  }\n\n  public static remove(cacheItem: CacheItem): boolean {\n    return Cache.items.delete(cacheItem.key);\n  }\n\n  public static get(key: string): CacheItem {\n    return Cache.items.get(key) as CacheItem;\n  }\n\n  protected static set(cacheItem: CacheItem): void {\n    if (!Cache.get(cacheItem.key)) {\n      debug.log('CacheItem for ' + cacheItem.key, cacheItem);\n    }\n    Cache.items.set(cacheItem.key, cacheItem);\n  }\n}\n\n// tslint:disable:only-arrow-functions\nexport class CacheItem implements CacheItemInterface {\n  public name: string = '';\n  public targets: Array<object> = [];\n  public services: Array<WebStorageServiceInterface> = [];\n  public utilities: Array<UtilityEntry> = [];\n  public currentTarget: object = {};\n  protected proxy: any = null;\n  protected _key: string = '';\n  protected initializedTargets: Set<object> = new Set();\n\n  constructor(cacheItem: CacheItemInterface) {\n    this._key = cacheItem.key;\n    this.name = cacheItem.name;\n    this.addTargets(cacheItem.targets);\n    this.addServices(cacheItem.services);\n    this.addUtilities(cacheItem.utilities);\n  }\n\n  public get key(): string {\n    return this._key;\n  }\n\n  public saveValue(value: any, config: DecoratorConfig = {}): any {\n    debug.groupCollapsed('CacheItem#saveValue for ' + this.key + ' in ' + this.currentTarget.constructor.name);\n    debug.log('new value: ', value);\n    // if (value === false && this.readValue() === true) debugger;\n    debug.log('previous value: ', this.readValue());\n    debug.log('targets.length: ', this.targets.length);\n    debug.log('currentTarget:', this.currentTarget);\n    debug.groupEnd();\n\n    // prevent overwriting value by initializators\n    if (!this.initializedTargets.has(this.currentTarget)) {\n      this.initializedTargets.add(this.currentTarget);\n      let readValue = this.readValue();\n      if (config.migrateKey) {\n        this.migrate(config, this.utilities[0].utility);\n        readValue = this.readValue();\n      }\n      const savedValue = (readValue !== null && readValue !== undefined) ? readValue : value;\n      let proxy = this.getProxy(savedValue, config);\n      proxy = (proxy !== null) ? proxy : value;\n      debug.log('initial value for ' + this.key + ' in ' + this.currentTarget.constructor.name, proxy);\n      this.propagateChange(savedValue);\n      return proxy;\n    }\n    this.propagateChange(value);\n    return this.getProxy(value, config);\n  }\n\n  public getProxy(value?: any, config: DecoratorConfig = {}): any {\n    if (value === undefined && this.proxy) {\n      return this.proxy;\n    } // return cached proxy if value hasn't changed\n    value = (value === undefined) ? this.readValue() : value;\n    if (typeof value !== 'object' || value === null) {\n      this.proxy = value;\n      return value;\n    }\n    if ((!Config.mutateObjects && !config.mutate) || config.mutate === false) {\n      return value;\n    }\n\n    const _self = this; // alias to use in standard function expressions\n    const prototype: any = Object.assign(new value.constructor(), value.__proto__);\n\n    prototype.save = function(): void { // add method for triggering force save\n      _self.saveValue(value, config);\n    };\n\n    // TODO set prototype for Array.prototype or something\n    if (Array.isArray(value)) { // handle methods that could change value of array\n      const methodsToOverwrite = [\n        'pop', 'push', 'reverse', 'shift', 'unshift', 'splice',\n        'filter', 'forEach', 'map', 'fill', 'sort', 'copyWithin',\n      ];\n      for (const method of methodsToOverwrite) {\n        prototype[method] = function(): void {\n          const readValue = _self.readValue();\n          // @ts-ignore\n          const result = Array.prototype[method].apply(readValue, arguments);\n          debug.log('Saving value for ' + _self.key + ' by method '\n            + prototype.constructor.name + '.' + method);\n          _self.saveValue(readValue, config);\n          return result;\n        };\n      }\n    }\n    Object.setPrototypeOf(value, prototype);\n    this.proxy = value;\n    return value;\n  }\n\n  public readValue(config: DecoratorConfig = {}): any {\n    const entry = this.utilities[0];\n    const value = entry ? entry.utility.get(this.key, entry.config) : null;\n    return (typeof value !== 'object') ? value : JSON.parse(JSON.stringify(this.getProxy(value, entry.config)));\n  }\n\n  public addTargets(targets: Array<any>): void {\n    targets.forEach(target => {\n      if (this.targets.indexOf(target) === -1) {\n        if (typeof target === 'object') { // handle Angular Component destruction\n          const originalFunction = target.ngOnDestroy;\n          const _self = this;\n          target.ngOnDestroy = function(): any {\n            if (typeof originalFunction === 'function') {\n              originalFunction.apply(this, arguments);\n            }\n            target.ngOnDestroy = originalFunction || function(): any {};\n\n            _self.initializedTargets.delete(target);\n            _self.targets = _self.targets.filter(t => t !== target);\n            if (!_self.targets.length) {\n              _self.services.forEach(service => {\n                service.keys = service.keys.filter(key => key !== _self._key);\n              });\n              _self.resetProxy();\n              Cache.remove(_self);\n            }\n            debug.groupCollapsed(`${_self.key} OnDestroy handler:`);\n            debug.log('removed target:', target.constructor.name);\n            debug.log('remaining targets:', _self.targets);\n            debug.log('cacheItem:', Cache.get(_self.key));\n            debug.groupEnd();\n          };\n          this.targets.push(target);\n        }\n      }\n    });\n  }\n\n  public addServices(services: Array<WebStorageServiceInterface>): void {\n    services.forEach(service => {\n      if (this.services.indexOf(service) === -1) {\n        service.keys.push(this._key);\n        this.services.push(service);\n      }\n    });\n  }\n\n  public addUtilities(utilityEntries: Array<UtilityEntry>): void {\n    utilityEntries.forEach(entry => {\n      if (this.utilities.findIndex(e => e.utility === entry.utility) === -1) {\n        this.utilities.push(entry);\n        entry.utility.set(this.key, this.readValue());\n      }\n    });\n  }\n\n  public resetProxy(): void {\n    this.proxy = null;\n  }\n\n  public propagateChange(value: any, source?: WebStorageUtility): void {\n    if (isEqual(value, this.readValue())) {\n      return;\n    }\n    this.utilities.forEach(entry => {\n      const utility = entry.utility;\n      // updating service which the change came from would affect in a cycle\n      if (utility === source) {\n        return;\n      }\n      debug.log(`propagating change on ${this.key} to:`, utility);\n      utility.set(this._key, value, entry.config);\n    });\n  }\n\n  protected migrate(config: DecoratorConfig, utility: WebStorageUtility): void {\n    const prefix = (config.prefix || Config.prefix) || '';\n    const keyExists = (key: string): boolean => key in utility.getStorage();\n    const migrateKey = keyExists(prefix + config.migrateKey!)\n      ? prefix + config.migrateKey!\n      : config.migrateKey!;\n    if (!keyExists(migrateKey)) {\n      return;\n    }\n    debug.log('Migrating', migrateKey, 'to', config.key, 'in', utility.getStorageName());\n    const value = utility.get(migrateKey, {...config, prefix: ''});\n    utility.set(this._key, value);\n    utility.remove(migrateKey, {prefix: ''});\n  }\n}\n"]}